Weak nonmesonic decay spectra of hypernuclei

TL;DR

This paper calculates kinetic-energy spectra and angular distributions for nonmesonic decay of hypernuclei using meson-exchange models and two shell model approaches, comparing results with recent experimental data.

Contribution

It introduces a comparative analysis of decay spectra using two versions of the independent-particle shell model with different treatments of hole states.

Findings

Spectra are computed for several hypernuclei.

Results show differences between stationary and quasi-stationary hole state models.

Comparison with experimental data highlights model strengths and limitations.

Abstract

We compute one- and two-nucleon kinetic-energy spectra and opening-angle distributions for the nonmesonic weak decay of several hypernuclei, and compare our results with some recent data. The decaymics is described by transition potentials of the one-meson-exchange type, and the nuclear structure aspects by two versions of the independent-particle shell model (IPSM). In version IPSM-a, the hole states are treated as stationary, while in version IPSM-b the deep hole states are considered to be quasi-stationary and are described by Breit-Wigner distributions.